Number of triples of different integers from [ 2,n ] with no common factors between pairs.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =2a(5) =8a(6) =11a(7) =18a(8) =20a(9) =42a(10) =45a(11) =79a(12) =88a(13) =102a(14) =119a(15) =183a(16) =193a(17) =277a(18) =297a(19) =335a(20) =363a(21) =491a(22) =512a(23) =619a(24) =664a(25) =756a(26) =802a(27) =1016a(28) =1037a(29) =1285